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I have described this casing as being 4 inch dia. but perhaps I should have been more accurate. It has an internal dia. of 98mm, an external dia. of 101mm and a rim dia. of 105mm. As it has been so severely truncated there is no way of knowing whether it had a taper or was necked. Although it has no head stamp, I had hoped that the machining might be distinctive to you knowledgeable guys.
My own thoughts have been that it is naval. Cartridges for naval guns appear to tapered and necked. I wondered if mine might be for a 3 inch naval gun.
To my mind there are three distinctive features to my casing, which I hoped might ring the odd bell -
1) The absence of head stamps - what might that signify?
2) The (unusual?) machining.
3) The passage between the primer recess and the casing.
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